/* * Copyright (c) 2025 Ian Marco Moffett and L5 engineers * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include /* * Handle a POSIX sigaction */ static int do_sigaction(int sig, const struct sigaction *act, struct sigaction *oact) { struct proc *self; if (act == NULL || oact == NULL) { return -EINVAL; } if ((self = proc_self()) == NULL) { return -ESRCH; } /* Don't overflow the signal table */ if (sig >= NELEM(self->sigtab) || sig < 0) { return -EINVAL; } if (oact != NULL) { *oact = self->sigtab[sig]; } if (act != NULL) { self->sigtab[sig] = *act; } return 0; } /* * ARG0: Signal number * ARG1: Action to set (act) * ARG2: Old action (old sigaction written here) */ scret_t sys_sigaction(struct syscall_args *scargs) { struct proc *self = proc_self(); int sig; struct sigaction *sap, *sap_old; int error; sig = SCARG(scargs, int, 0); sap = SCARG(scargs, struct sigaction *, 1); sap_old = SCARG(scargs, struct sigaction *, 2); /* Sigactions at a valid address? */ error = proc_check_addr(self, (uintptr_t)sap, sizeof(*sap)); if (error < 0) { return error; } /* Old sigactions at a valid address? */ error = proc_check_addr(self, (uintptr_t)sap_old, sizeof(sap_old)); if (error < 0) { return error; } return do_sigaction(sig, sap, sap_old); }